CVE-2024-40909
highIn the Linux kernel, the following vulnerability has been resolved: bpf: Fix a potential use-after-free in bpf_link_free() After commit 1a80dbcb2dba, bpf_lin…
Vendor / product: Linux — linux kernel
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a potential use-after-free in bpf_link_free() After commit 1a80dbcb2dba, bpf_link can be freed by link->ops->dealloc_deferred, but the code still tests and uses link->ops->dealloc afterward, which leads to a use-after-free as reported by syzbot. Actually, one of them should be sufficient, so just call one of them instead of both. Also add a WARN_ON() in case of any problematic implementation.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63a 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/e8ccda39b395169622855607085cdeef4d376e0f 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63a af854a3a-2127-422b-91ae-364da2661108
- https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209 af854a3a-2127-422b-91ae-364da2661108
- https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382 af854a3a-2127-422b-91ae-364da2661108